i've found vefore that the yanks only ever track it as far as the depo, and after that the next message is when it turns up. my guess is its possibly in the uk or about to hit, but its customs on this side that is the slow progress.
USPS Parcels get handed over to Parcel Force when they enter this country so put the USPS number into the Parcel Force website once it arrives in this country and then you'll get the most recent info. The USPS web site goes a bit buggy when the parcel enters the UK and says "Delivery Attemped Abroad" even though it hasn't left customs yet!
I've just put your tracking number into the Parcel Force web site and it says it's still in customs. Once it clears there you'll get a letter a few days later asking you to cough up a £13.50 "Handling Fee" plus whatever customs have added on. Only once you've paid that will they release it for delivery. They way FedEx and UPS do things is much better as they just focus on delivering ASAP and then bill you for customs charges afterwards. And their handling fees are smaller too.
+1
I hate parcel force with a passion - they tried charging me £6 to change the address on a package that they had entered wrongly